Optical lens



FIG. 1 is a perspective view of an optical lens showing the claimed design;

FIG. 2 is a front elevational view thereof; the rear elevational view being a mirror image of the front elevational view;

FIG. 3 is a left side elevational view thereof; the right side elevational view being identical to the left side elevational view;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a cross-sectional view taken along Line A—A of FIG. 3. 

The ornamental design for an optical lens, as shown and described. 